AX_PATH_GENERIC has been extended to allow setting LIBRARY_LIBS and LIBRARY_CFLAGS variables on configure command line or in the environment to override the normal values returned by `library-config --libs` and `--cflags` respectively. See <http://savannah.gnu.org/patch/?7490> for further details.

AX_LIB_EXPAT has been modified to save the found library in EXPAT_LIBS instead if EXPAT_LDFLAGS. This is necessary to avoid build failures when linking with --as-needed. See <http://savannah.gnu.org/patch/?7489> for further details.

AX_PKG_SWIG has been extended to find SWIG v2 as installed by Ubuntu Maverick and Ubuntu Natty.

The new macro AX_BERKELEY_DB_CXX has been added. It is a variant of AX_BERKELEY_DB that has been adapted to check for C++ headers and libraries. See <http://savannah.gnu.org/patch/?7446> for further details.